class Animal:
    def __init__(self, species, sound):
        if species in ['猫','狗','羊','猴子','老虎','大象']:
            self.specise = specise
            self.sound = sound
        else:
            self.species = None
            self.sound = None
    def speak(self):
        if self.species == None:
            print('动物园里没有该动物，游戏结束！')
            return False
        else:
            print(self.species, self.sound)
            return True
        print('动物园里有什么？')
        flag = True
        while flag:
            s = input('请输入动物种类和叫声   ：')
            list1 = s.split('  ')
            animal = Animal(list1[0],list1[1])
            flag = animal.speak()